Update picas examples and token commands

[xinan1911]

edit README.md

[natalieda]

I suggest to revise the example to be workable and easier to follow. My recommendation is to split the quick and fractals example in different sections and execute each one locally, using slurm and on the grid. For both examples the necessary files should be fetched from the Github repo and not from the Grid docs tarballs.

[xinan1911]

@hailihu This is ready for review. And if everything is okay, then for merging.

[hailihu]

I suggest to revise the example to be workable and easier to follow. My recommendation is to split the quick and fractals example in different sections and execute each one locally, using slurm and on the grid. For both examples the necessary files should be fetched from the Github repo and not from the Grid docs tarballs.

It seems that you have not implemented this recommendation (totally) yet. In particular, there are still links to the Grid docs tarballs for downloads that do not work.

[hailihu]

There are some changes and fixes needed.